A closed metallic cylindrical box is 1.08 m high and its base radius is 42 cm. If the sheet of metal costs Rs. 90 per m2, then the cost of the material used in the box is: (Take π = 227)

Find the approximate volume and surface area of a sphere of radius 6 cm. (Use π = 227)

Ram has two spherical balls of radius 10.5 cm each and Meena has six spherical balls of radius 7 cm each. What is the total volume of the balls that Meena has?